What accounts for about 50 percent of the variability in people's trait-level happiness, according to Lyubomirsky et al., 2005?

Question

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According to Lyubomirsky et al. (2005), approximately 50 percent of the variability in people's trait-level happiness can be attributed to genetics. This means that half of the differences in happiness levels across individuals are due to differences in their genetic makeup.

What Accounts for About 50 Percent of the Variability in People's